Al, thanks for clarifying the spelling.
It's good of you to offer to send me the Whiteside details from 'The Famine Immigrants'. I'm not sure how useful it will be to have that information because it will be difficult to know where in Ireland they came from. Most Whiteside families in Ireland are in the northeast of the country and are not related (except in a most remote way) to the Whiteside families of counties Mayo and Sligo. On the other hand, given that the Famine hit the west of Ireland more severely than the northeast, maybe it will be possible to work on the basis that Whiteside immigrants were less likely to have been from the northeast. We'll see.